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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fa5f31152141f17509f42a0a084715c7cbd3573d9df77bc656eb3ef1585fe0e' 
  AND token = 'h3JEhdTR2z0Ewi0xZLgnHPncJ6lS6N2wGnRSqu88rxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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