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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07bb3d8dd31153bede1d7b313579ea0d60794761c11cce8684e8cbdc7dd0f70e' 
  AND token = 'SQ4UPZrNd5z2wXut1pUA1fLvXF3vgapVtXWR7WsaLUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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