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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b89d6b10e846487283502a651c8a269cea856a63e9feda040156073e5474d324' 
  AND token = '/YuRmNwCD4dA1ykZXXstPwTOca1jQuM1tUOqbVAWKyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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