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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c13c582aaebb73524262dff587cd6bb567cf6b2b04a9c11a5dfb4ba603fafca8' 
  AND token = 'US+DUKwBEMPdiFpdktLJrh2to+ECornkL/nxlfFMRZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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