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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f744d4f5d11864d048dc34b42f5ad795087f802505af3052ede701e3f73e54d2' 
  AND token = 'KmOoYY4fcogktqrB4u5mY4BWRxRRED2a3YUHCOrfGU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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