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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5163d6edd10fab3fa010b5e833588e5d624bc5725426a2729ec9fa31618c8a9' 
  AND token = 'D0sGVZWdZi9ABiiGEcGSwBBT3iCSYFy6sXA36K/616I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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