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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7c8755d93a07decd6a243e320dd98ef720022a267fcd5a8c2287f4c0402d5c9' 
  AND token = 'rG5yffNk6yNw7sSAghBLEEz1b+MjuHl/w6XCPgejV7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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