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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddd546e1d3235aa4c8f2945d9cf5be70265f4c73717a91db13631077f7bc5bce' 
  AND token = 'rw9NJHBDN3yyEFM1edmjJT4gmIEgdkdKMyPD97dG5tw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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