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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d12a8ae17e2752d4c37d3a5ec416f45445918a2d5d24f13ac25d562c3d7925b' 
  AND token = '7FPlxmUY2PC1GtFn7l2z2Y7NzEQAX7b+bcntO/APxuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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