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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc9584d05dca44ff49cc996af25355accfd559b0f934fb3832c974d7ca28d1a1' 
  AND token = 'DVio7kmWh6Hu9xYfLIqkyobYX8P4GXDaaoUSj5UqbJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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