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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec184b0a9edfa49c62cdc4acbcfb49d16d3a4fd8f657c2c9743e69d5b312d248' 
  AND token = 'X7VPEhXT6Qk6igy2ba68+N1tbiyyjUmHFM+qhAOWHI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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