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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa6c78fccbaa88a27c611e383516a90841301eb71119062a52cd6835b021ce2b' 
  AND token = 'XTyezTa45RN0O7H1gxz4g/HUuGi+CslkD6ma87V/8YI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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