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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9d596ad7c239c18e9ac4170f8816e45dfb795a48df4a665376ce5fbb51d46b5' 
  AND token = 'pzvmVztfamk3+01PG3gYpQ4X32cQZKzLtn2654ZtRCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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