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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d5bcc2668de918f00f144744f10a2864180d52a7a092759792917a96ce96edb' 
  AND token = 'grBMrSaBrmaVjhcS6i247ngqlL9n7PG63/h2xBqTS2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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