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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9345df09f70b4b1707e96f643e16e39ac0d1fb8c9596b83c1d49f76556647c7' 
  AND token = 'rgLectanPVUtmSkyqP+TSRmiX2w8caTPoZ6/DuWp0mc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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