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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30fcfbece5b42b043a31d164dc4e2cc249e0ce0975486eb68d3c96c0e389ac57' 
  AND token = 'Bx1AUFqgpaKzV6Gnq9L14PqDjU+XorCosXq6CcypVRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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