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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29305630f1ed752c17de07e1b233499afff6b012ab37b20f4f318c22b4368e81' 
  AND token = 'sbP0+ldvxSSnT/6u24GCbJuGMHm6SUCHnSFVrk/7wnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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