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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6556ea2c1e5f8f03e069d2b285d78aad14a7ad1491bc924110b347feda1973e7' 
  AND token = 'SZtJctMtg737uSRvMC1OOHlmEnh1E35DXsbfTo4M7Ws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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