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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2829500bfd679a376e8e49b7835add9af936e0dd6221238b6201c8c5064e1479' 
  AND token = '7PnsWk2RK9Kte7SI/Qb4YLzjJfPb3RPY8aANmj7B2+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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