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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0952d06302d49918a5abb74344f743c5dd3d3442f2b352739886cf9c6502ae5' 
  AND token = 'ZsOuM+vgeLDQjml6QQLRQNn6LMLLBv/I4vSj8jCn1TA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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