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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bc74bd5a0a1c1cb0d711acb214d4f22665fa6b63deff5edc7e8853e11e13115' 
  AND token = 'w1grbW6mypb7FFdDgmxPl7TcPbGob81Z/+deK2z5gf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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