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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67d3cb31e8f99350c60ebd68a5a84d3e3c6c63012224fde5f5c35264d1c398f9' 
  AND token = 'ZlSPSlDzysHELhnzzum6pAFyYQ0Mtv064HCnD1sTFts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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