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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09f439c24c2e3cd59638961c6a6af815e9677a8bdc6fcf51c59914ce06267916' 
  AND token = '75TjcmD1m0u+m/fhnnD2DBd7vYZP56XdZKmw87MkwGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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