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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'beb76da39ad4953af8b1072010d20c75f438cb43899c75316ec457d70590c7c9' 
  AND token = 'u5RIZQguyROIfRTYK3SEjcjFUC9/y37W4uTIESGk2aE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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