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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15d45699f3d73f92c75918d45c6391bf6f831c0003ebb1a1e0cd30ea7a179067' 
  AND token = 'oWVDFIFvC+1lEV0kMl2siubc79rOveSv2rYFKEDsvbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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