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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9558e4a3e644ea28f27938ba6a7bcf32a98e3dc426b182366c182c861bd349e8' 
  AND token = 'X/M3jghF1wfy0SrrWGahGlrVoyjHOzaqaT39HGEV5D4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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