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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '632a5ee772433d929c8ede3b76377218148a69487747cf5f5abd79d16d3ee15d' 
  AND token = '700iWpU5qj/5AQPi/NTDicuYGhtr6zrriraJ4BoMlAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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