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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c32dcec191330dcf3422bb0845f4d0f8a340ef29cddd2ead4f0ec6c7fad31b7' 
  AND token = 'yn/hPYJOCztI+60pxTdxgYOOn7/dotK1txsPud8Iz2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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