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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c931b2d9b52711b3c3beaf1413cde60f13e27bfa510280a48b14cb23ebf19812' 
  AND token = 'eo0HrB+Mpl2A4EHrhIzKRyV3OxvoWNDP7XYi6PgNHz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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