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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2cf1cd7a0804170238b17334c5e8021578464e9805c534e20f306f5e0278b7c' 
  AND token = 'UeyHybPMlZ2qwnD8eMO+iXkLjdt6TCujj8PjyKfx15E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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