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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ee04cd91be7c49c22e55a3bb845729b2d55495881c29505b0c570c95a2c854e' 
  AND token = 'yxepX2ZKZUycM1zXWc4dF81kZ/1ipQj5c/TJuEmsz4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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