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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '019ed78d939e54ba32dbd475a9e3ce0729f6bd17ef2e2fd47265b393da8a852a' 
  AND token = 'kNkae9yTa+9hxiK9OHarw+OPpFwph9hbDnf7A9rD7ao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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