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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79bea34906e7dd578e1150f8ae3765a15fc36571a535a0db77f6af09961afd02' 
  AND token = 's9lhBkloeCNdszlZZNVfBggebGs+TS7K+BOg79t9l+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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