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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85a183b9ff8cc143fa07dd92e0d46969f8a16b2447cfc9bea6253eee0a7aca71' 
  AND token = 'EprvqCVsKLaV20uA62ik5e3j6SaxEo7S+D9YyuPH7Qc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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