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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c20bcaf2f5f925865e2a0f8a64af40bb9f8cd094f22f5fac4842e85fd834fe93' 
  AND token = 'm0zjHo6yu+KNwLriD4H+kVaFA60GvJAVuRBAHyuDb3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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