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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a754b358c7d313ddf0ef3a436b79013929147b10763c930580d87710eccbd2ad' 
  AND token = 'uK1ub+5wl4yWaRCImtPTNwJpQtl9w93HhSLUzLwpUys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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