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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0d2ce47758443c3264b3b1c1b396ae12c25d9adc1d20e1af05e518958739df4' 
  AND token = 'swmE9FYEKzl8Bxl1wInMm99uHVKOs+3/1fcbpeodlcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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