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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34f54e0f26de9c9ccaab9745a248fd7505af419ce5b52e5b9fd766c6e6e1ba47' 
  AND token = 'OTYfJjkvdtx4gr3Miz0IsbjMDEjN37SlNg5J+/ufck4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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