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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90ec5ed7dddb05c0578cbb7fcdfb26ca162e75575d0c6bb7a104147dc5451ab8' 
  AND token = 'WUki9oT4uherSilOXtj7Lys+K5p/8z+4/AYeeJHTFJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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