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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12c7c6d7dda0da54efb207129397e162db1e43e2592a94f5eb547a1ced1cfc0a' 
  AND token = '/y4RhjWiKmGWkMo95ChXJloBrK83Nm7uksBb7gJkD5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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