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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a52a9076ea9acaad0b2f185f6e4f489f88e85acec4cd2b545f90ef2d07335e06' 
  AND token = 'd3d1v+jRdyEzoM4cvxkh2uMlWFwEewcr5juodl3PMW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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