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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aba1764c159c351bec072af8931c924a2443d674e4f9b86ba13cfe81173cfe37' 
  AND token = 'dCtyGJ+yNnxPlUREU4VYWJQBQf+D9Tc1aN4ZyHpHcb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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