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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d93952960475bf8a98a227fb571e3231fce842250aa048c0272be394336e7bf' 
  AND token = 'm2dAOAGNQZ7i/im6iW7bW4NuGmPr3ULGZllUJeb+s1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}