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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a95a27f9604e72f5d92da6d767af094cf71d37ad0895cbb3125d023bee2b9e4' 
  AND token = 'f33PymIC+XGLHFiR3gq04VQg9Pk0k9H9wjTy6046JrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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