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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7976fd998f0d8b30674113422f147550bfb23b01c5e203f5f13eb1d24ac003da' 
  AND token = 'jeMBuj0vLVQr/a97aNonTw1T0Spj4+CW2yhshXl2Ck4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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