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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ceea5e07dce07415f4a8faf21684c60531eb2d8c4b0b4ac8a4013a30372d1ff' 
  AND token = '3dpELLcEFUZfWMGD6OT7r83Rm/aqjXKSFRzeXq84v8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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