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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '109a6a608d3138150fb2219e11d13f22ef9937dfad07e8c64c51052b11b496f4' 
  AND token = '7XgSl0K0xw3eOXBEYOLaq8JIGBMQ91ci5XtB6CDSTnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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