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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '619cf72cf550f45823148fe65862a8e209e6e3702252535ba9787ee80d335acc' 
  AND token = 'OLCJvea+ndFPBKODCvxrtfY888VF3AD4K7sePCmhDv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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