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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1d238e786307bf3a1344d57d58f6314c72d63abce41ad087a7f07e73e0e2a7a' 
  AND token = 'x0ujzjXnjwD5k82N7zfW9zALIUEdEr72w+eHbPus8AA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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