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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05202db431c6938a8a80b62ba48918305136b7ee0809f8fe189376570fb8b88a' 
  AND token = 'vNwrcT8GGdc5B8RpD4cTGvgl+lmXPLdCiQQ4R5B6nwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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