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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d5107628f683de63450658fcaea0a139a31236e3c55590147040147fe73eda0' 
  AND token = 'ETzgkHfLkqijhtVaHdhjkHSQ1MSztxRYu2swwG3gTHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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