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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44fa8fc707bf0cb253fa443c1255b7a6d1eae8a45b59452b45acde0102e9599e' 
  AND token = '7ouErgUQk6h1t1K2cpou8/ebTSyMwAO5QjyKpp94txo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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