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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6de1d84e96412370d0b6b4199105bc0ab4dc197881b4a0c7e24b8632242a01e' 
  AND token = 'HgQlI7Q5oSbfcJL5ZcQanfikjEQ8sXzTMRt58XWk/5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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