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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd00b6357b97397198211dd286c36e14cd9f8428631debbfe3c9e34a6b4dabce5' 
  AND token = 'rDo3d11mxTRYv2QmX60RDsV5gy3eFHg8bMprAgt2C2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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